a month ago
I have a Honeywell TH8320 and would like to install my 3rd gen nest. When I go through the setup process it says my wiring is not compatible. Can someone verify this please and give me instructions on how to wire if it is compatible.
Wiring
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a month ago - last edited a month ago
Your current thermostat is compatible.
Give this a try
Gray - Y2 to Y2
Blue - E to * (set as emergency heat)
Pink - S1 not used, tape off
Brown - S2 Not use, tape off
Red - R to Rc (jumper to RC not needed)
Orange - O/B to O/B
Yellow - Y to Y1
Green - G to G
Black - C to C
a month ago - last edited a month ago
Your current thermostat is compatible.
Give this a try
Gray - Y2 to Y2
Blue - E to * (set as emergency heat)
Pink - S1 not used, tape off
Brown - S2 Not use, tape off
Red - R to Rc (jumper to RC not needed)
Orange - O/B to O/B
Yellow - Y to Y1
Green - G to G
Black - C to C
4 weeks ago
Thank You very much @Patrick_Caezza !!!!
Because I'm a curious person, why are pink and brown not needed on the Nest but are on the Honeywell?
4 weeks ago
Those two wires are for external sensors that the Nest doesn't support.